Hi there,
First of all, I never did a job portal so far, and will do it from scratch for you.
Regard security, I did many online investment based websites which involve automatic deposit and withdrawals from different e-currencies, and I did strong security via PHP, and never ever anyone can touch the script or amount in investors accounts. So, you can understand how securely I can code via PHP.
Let me know if you agree with the quote, milestones and time frame specified, so we will discuss the project in detail.
Looking forward to hear you soon!
Best Regards,
Kashif (coder786sl).